cities = [
    {
        id: 1,
        name: '天津',
        areas: [
            {
                id: 11,
                name: '河西区'
            }, {
                id: 11,
                name: '河东区'
            }, {
                id: 11,
                name: '河北区'
            }, {
                id: 11,
                name: '和平区'
            }, {
                id: 11,
                name: '南开区'
            }, {
                id: 11,
                name: '红桥区'
            }
        ]
    },{
        id:2,
        name:'北京市',
        areas:[
            {
                id:1,
                name:'东城区'
            },
            {
                id:2,
                name:'西城区'
            }
        ]
    }
]